Fluid Multitasking on iOS

Sebastian: We had an experience recently where we prototyped direction that we were super excited about. Clearly didn't work, considered it a let's move on. A couple months later, came back and had this inkling that maybe some things had changed in our product which might suggest this feature would work again. And I think specifically took it to a much higher fidelity than we had previously. All of a sudden, I think it's the coolest thing we've built so far,. But the larger question is as a team that experiments widely and quickly and iteratively and is not afraid to take the research process, which means tossing stuff out. Any tips for how do you know when